[RE-wrenches] Trace SW Stacking Cable?

Mark Edmunds mark.edmunds at xantrex.com
Wed Apr 1 09:41:30 PDT 2009


Wrenches - William is correct, the SWI cable is not a straight through
printer style - it must be wired per the drawing on the link below.

 

Cheers,

 

Mark

 

 

Mark Edmunds

Director Engineering

Residential Renewable Energy Markets

Xantrex Technology Inc.

mark.edmunds at xantrex.com

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Miller
Sent: Tuesday, March 31, 2009 9:51 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Trace SW Stacking Cable?

 

Carl:

I have checked with Xantrex.  I would not make a declaration on the
Wrenches forum to my esteemed colleagues unless I was quite certain.
Find the "SWI Stacking Cable wiring diagram" on our web site at:
http://millersolar.com/resources/resources.html under "Manufacturer's
data".  This diagram came directly from a Xantrex engineer.  I have no
reason to doubt it's authenticity. This is not the pin out for a
"standard" DB25 cable.  Not also the link just below it for "Not an SWI
cable"  This is your "standard" cable.  I fished this out of my attic
this evening and scanned it still in the package.  Note it is listed as
a "straight through" cable.  This means pin 1 connects to pin 1, pin 2
to pin 2, etc.  This is not the same wiring as depicted in the SWI
stacking cable diagram.

I believe you have suggested twice that solar installers grab the
nearest "standard" DB25 cable and give it a try.  I feel compelled to
correct the record publicly.  These are not the same cables and
unspecified damage could occur.  I know I once shorted out a sync cable
for Heart Interface inverters and blew two of them up catastrophically
two days before Christmas.  It was a very unpleasant surprise for the
client (who had guests coming) and for my self.  These cables are a
direct link to the FET control circuits and need to be treated with the
utmost caution.

I don't know what would happen to two SW inverters if connected with
your straight through cable, but I recommend strongly against trying it.
Please do not recommend practices unless you are quite certain they will
cause no harm.


Respectfully,

William Miller

PS:  Printer cables were never DB25-DB25.  They were DB25 to Centronics.

Wm





At 10:01 AM 3/31/2009, you wrote:



William,
 
  I used an off the shelf cable to use with the SW and PS remote, it was
a double male ended  25 pin cable. They were formally used as
printer/computer cables. I believe the stacking cable is the same style.
You could check with Xantrex.
 
  Carl Hansen

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